I have such doubt regarding the topic of this discussion too. Hopefully what i get to know can help out at least a little here.
When i repot, i consulted one of the local nursery here. He says tight moss will help to make sure the water in the moss is distributed evenly within the pot due to the nature of the moss that wicks water. Which will assist in judging when to water.
Loosely pack moss will have issues where the top layer of moss is dried and crispy but the lower moss are still moist. This might leads to root rot if the grower mistakenly continuously water it based on the dryness of top moss.
Therefore finding the balance or correctly compact is important.
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